| Starter | Tm | Tier | Game |
|---|---|---|---|
| Tom Seaver | NYN | 10.94 | 197308100_NYN_SFN |
| Bert Blyleven | MIN | 5.56 | 197308090_BAL_MIN |
| Wayne Twitchell | PHI | 4.27 | 197308100_PHI_LAN |
| Rick Reuschel | CHN | 3.85 | 197308110_HOU_CHN |
| Nolan Ryan | ANA | 2.92 | 197308110_ANA_BOS |
| Starter | Tm | Tier | Game |
|---|---|---|---|
| Jim Lonborg | PHI | -2.85 | 197308090_PHI_SDN |
| Steve Arlin | SDN | -1.76 | 197308100_WAS_SDN |
| Mike Torrez | WAS | -1.38 | 197308090_WAS_SFN |
| Steve Busby | KCA | -1.21 | 197308090_BOS_KCA |
| Tom Timmermann | CLE | -1.01 | 197308110_CLE_TEX |
Based on accumulated WAA for this season up to 1973-08-11.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +001+ | 8.71 | Tom Seaver | 203.7 | NYN |
| +003+ | 7.1 | Ken Holtzman | 231.3 | OAK |
| +005+ | 6.37 | Wayne Twitchell | 172.7 | PHI |
| +008+ | 6.06 | Don Sutton | 203 | LAN |
| +010+ | 5.79 | Rick Reuschel | 189 | CHN |
| +011+ | 5.76 | Bert Blyleven | 225 | MIN |
| +012+ | 5.65 | Jim Palmer | 205.7 | BAL |
| +019+ | 4.47 | Fred Beene | 89 | NYA |
| +020+ | 4.44 | Bill Lee | 199.3 | BOS |
| +024+ | 4.35 | Nolan Ryan | 237.3 | ANA |
| +027+ | 3.96 | Bob Gibson | 189 | SLN |
| +028+ | 3.95 | Jim Colborn | 219.7 | MIL |
| +034+ | 3.55 | Steve Renko | 166.3 | WAS |
| +036+ | 3.4 | Nelson Briles | 164.7 | PIT |
| +037+ | 3.37 | Claude Osteen | 180.7 | LAN |
| +038+ | 3.37 | Terry Forster | 97.7 | CHA |
| +040+ | 3.34 | Bill Singer | 216 | ANA |
| +041+ | 3.32 | Ron Bryant | 196.7 | SFN |
| +042+ | 3.3 | Stan Bahnsen | 209 | CHA |
| +043+ | 3.29 | Dock Ellis | 163.3 | PIT |
| +048+ | 3.2 | Don Wilson | 183.3 | HOU |
| +049+ | 3.17 | Rogelio Moret | 89 | BOS |
| +050+ | 3.15 | Andy Messersmith | 190.7 | LAN |
| +052+ | 3.06 | Ross Grimsley | 174.7 | CIN |
| +056+ | 2.95 | Rick Wise | 187 | SLN |
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